Fixing a bug where odbc/mssql/oci8 db drivers would encounter a PHP error due to a function being moved from the input to security class.
Moving remove_invisible_characters() to Common.php so the entire class does not need to be instantiated in those database drivers.
diff --git a/user_guide/general/common_functions.html b/user_guide/general/common_functions.html
index 196e377..0e68d11 100644
--- a/user_guide/general/common_functions.html
+++ b/user_guide/general/common_functions.html
@@ -99,6 +99,12 @@
<p><a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">See here</a> for a full list of headers.</p>
+
+<h2>remove_invisible_characters(<var>$str</var>)</h2>
+<p>This function prevents inserting null characters between ascii characters, like Java\0script.</p>
+
+
+
</div>